CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Vessel revenues		$ 583,816	$ 955,400	$ 1,468,358
Other operating revenues		17,795	23,662	27,159
Total revenues		601,611	979,062	1,495,517
Costs and expenses:
Vessel operating costs		359,171	561,133	834,368
Costs of other operating revenues		12,729	18,811	26,505
General and administrative		145,879	153,811	189,819
Vessel operating leases		33,766	33,662	28,322
Depreciation and amortization		167,291	182,309	175,204
(Gain) loss on asset dispositions, net		(24,099)	(26,037)	(23,796)
Asset impairments		484,727	117,311	14,525
Goodwill impairment				283,699
Restructuring charge			7,586	4,052
Total costs and expenses		1,179,464	1,048,586	1,532,698
Operating loss		(577,853)	(69,524)	(37,181)
Other income (expenses):
Foreign exchange gain (loss)		(1,638)	(5,403)	8,678
Equity in net earnings (losses) of unconsolidated companies		5,710	(13,581)	10,179
Interest income and other, net		5,193	2,703	1,927
Interest and other debt costs, net		(75,026)	(53,752)	(50,029)
Total other income (expenses)		(65,761)	(70,033)	(29,245)
Loss before income taxes		(643,614)	(139,557)	(66,426)
Income tax (benefit) expense		6,397	20,819	(1,077)
Net loss		(650,011)	(160,376)	(65,349)
Less: Net income (loss) attributable to noncontrolling interests		10,107	(193)	(159)
Net loss attributable to Tidewater Inc.		$ (660,118)	$ (160,183)	$ (65,190)
Basic loss per common share	[1]	$ (14.02)	$ (3.41)	$ (1.34)
Diluted loss per common share	[2]	$ (14.02)	$ (3.41)	$ (1.34)
Weighted average common shares outstanding		47,071,066	46,981,102	48,658,840
Adjusted weighted average common shares		47,071,066	46,981,102	48,658,840

[1] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.

[2] The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.